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John Alexander Cooper - Public Domain
Elfriede Lohse-Wächtler - CC BY-SA 2.0
Bain News Service, publisher - Public Domain
Unknown author, photo taken in 1916 - Public Domain
Robert Foothorap - Public Domain
Dmitry Rozhkov - CC BY-SA 3.0
CC BY-SA 3.0
Library of Congress - Public Domain
Hecht, Gerald V. (National Institutes of Health). - Public Domain
Denis351997 - CC BY-SA 4.0
unknown - Public Domain
anonymous - Public Domain
photographer not credited - Public Domain
Unknown, but probably a professional photographer.<br/> - Public Domain
Frank Ockenfels - CC BY-SA 3.0
Detroit Public Library - Public Domain
Jim Halsey Artist Management Agency - Public Domain
Amer Shomali -
Smithsonian Institution -
original uploader - Public Domain
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Harris, Robert, 1830-1894
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Simmons, John, 1918-1979
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John Alexander Cooper - Public Domain
Ryerson, George Sterling, 1854-1925
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Elfriede Lohse-Wächtler - CC BY-SA 2.0
Lohse-Wächtler, Elfriede 1899-1940
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Cadmus, Paul, 1904-1999
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Bain News Service, publisher - Public Domain
Wilson, William Bauchop, 1862-1934
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Widtsoe, John Andreas, 1872-1952
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Unknown author, photo taken in 1916 - Public Domain
Cox, Percy, 1864-1937
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Robert Foothorap - Public Domain
Tan, Amy, 1952-
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Dmitry Rozhkov - CC BY-SA 3.0
Kantor, Maxim, 1957-....
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CC BY-SA 3.0
Svoboda, Ludvík, 1895-1979
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Library of Congress - Public Domain
Graham, Jorie, 1951-....
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Hecht, Gerald V. (National Institutes of Health). - Public Domain
Nirenberg, Marshall W., 1927-2010
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Caymmi, Dori, 1943-
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Bassi, Laura, 1711-1778
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Denis351997 - CC BY-SA 4.0
Coulomb, Jean.
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Fowler, Charles Henry, 1837-1908
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unknown - Public Domain
Kobold, Hermann, 1858-1942
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Jędrzejewiczowa, Ludwika (1807-1855).
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anonymous - Public Domain
Boutet de Monvel, Bernard, 1881-1949
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photographer not credited - Public Domain
Rihbany, Abraham Mitrie, 1869-1944
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Unknown, but probably a professional photographer.<br/> - Public Domain
Hewes, David, 1822-1915
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unknown - Public Domain
Mortillet, Gabriel de 1821-1898
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Togliatti, Palmiro, 1893-1964
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Frank Ockenfels - CC BY-SA 3.0
Lennon.
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Detroit Public Library - Public Domain
Porter, Augustus Seymour, 1798-1872
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Jim Halsey Artist Management Agency - Public Domain
Williams, Tex
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Amer Shomali -
Darwīsh, Maḥmūd, 1941-2008
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Smithsonian Institution -
Goldthwaite, Anne, 1869-1944
Image from Wikimedia Commons
original uploader - Public Domain
Dyer, Alexander B. (Alexander Brydie), 1815-1874